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Using The Allison World Transmission Shift Selector

Using The Allison World Transmission Shift Selector The touch pad commonly found in motorhomes equipped with this Transmission is more than just a gear Selector . It serves as a communication link between the Transmission and the operator. By CAROL F. MAXWELL &. GURDJIAN, F76350. A. llison introduced its World Transmission to the motorhome marketplace several years ago. The MD version used in motorhomes was followed by the HD version, which is used in conjunction with engines having horsepower ratings in excess of 300, primarily heavier bus conversions. Although minor programming differences exist to accommodate the extra work load encountered by the HD version both versions of the World Transmission are six- speed units with electronic controls that function in a similar fashion. This sophisticated, electronically controlled Transmission provides more functions and features than automatic transmissions of the past.

then shift hydraulically to a default gear in “Convertor Mode” and release the lock-up clutch. This protects the transmission and allows travel with a restricted gear range to obtain service. As expected, a sophisticated transmission needs an equally sophisticated shift selector. Allison supplies either a touch pad or lever-type shift ...

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Transcription of Using The Allison World Transmission Shift Selector

1 Using The Allison World Transmission Shift Selector The touch pad commonly found in motorhomes equipped with this Transmission is more than just a gear Selector . It serves as a communication link between the Transmission and the operator. By CAROL F. MAXWELL &. GURDJIAN, F76350. A. llison introduced its World Transmission to the motorhome marketplace several years ago. The MD version used in motorhomes was followed by the HD version, which is used in conjunction with engines having horsepower ratings in excess of 300, primarily heavier bus conversions. Although minor programming differences exist to accommodate the extra work load encountered by the HD version both versions of the World Transmission are six- speed units with electronic controls that function in a similar fashion. This sophisticated, electronically controlled Transmission provides more functions and features than automatic transmissions of the past.

2 Transmission functions and features. The Allison World Transmission can adapt its Shift schedule to accommodate driving habits. It learns to Shift according to the acceleration pattern and will adapt to a different driver within a short period of time. It is programmed with an alternate Shift schedule, or (secondary mode) function, which will be discussed later in the article. It can automatically downshift as many as two gears, within rpm limits, during engine braking to provide maximum brake horsepower. In addition, it will automatically upshift or prevent downshifts to eliminate an engine over-rev condition. Original equipment manufacturer (OEM) Shift Selector Functions: that shifts gears at lower rpm to specified downshift schedules can To select gears. provide better fuel economy. This is be made available for use with To indicate the status of the an appropriate choice when exhaust brakes.

3 This causes the Transmission . traveling on flat terrain. In situations Transmission to downshift to a lower To select a secondary mode of where maximum power is required, gear to enhance engine brake operation. such as climbing grades and performance, provided that this does To electronically check oil level utilizing maximum engine braking not exceed maximum engine rpm. (if so equipped). capabilities, the standard Shift The World Transmission has a To clear a temporary DO NOT schedule is preferred. shallow oil pan option, which Shift light. The touch pad has two digital increases ground clearance in pusher To indicate the fault causing the displays: Select, which shows the applications. It has an oil sensor DO NOT Shift status. gear or range of gears chosen by the option to detect Transmission oil To record, store, and play back operator, and Monitor which level, a feature that is now supplied the last five diagnostic codes.

4 Indicates the current gear of automatically with the shallow oil The pad has six push buttons, Transmission operation. In addition, pan option. labeled "R," "N," "D," " " " " and a Mode On light indicates that the The Transmission can detect "Mode." The first three buttons are secondary mode has been chosen. malfunctions and protects itself by used to choose "reverse," "neutral," When the ignition is turned on illuminating a dash-mounted DO. or "drive" The up and down arrows the DO NOT Shift light, usually NOT Shift warning light. It will are used to move through the range located on the dash, illuminates then Shift hydraulically to a default of six forward gears in "drive," This momentarily, accompanied by gear in Convertor Mode and is very similar to any other audible tones (short beeps) coming release the lock-up clutch. This automatic Transmission , but the from the Shift Selector .

5 This tells the protects the Transmission and allows touch pad is much more than just a operator that the indicator light is travel with a restricted gear range to conventional gear Selector . It is the functioning. The Select digital obtain service. communication link between the display will read N. When the As expected, a sophisticated Transmission and the operator. engine is started, the operator may Transmission needs an equally The Mode button is used to choose reverse, drive, or, Using sophisticated Shift Selector . Allison invoke a special function that has the up and down arrows, a range of supplies either a touch pad or lever - been programmed into the electronic forward gears. After the operator type Shift Selector . Most control unit (ECU). In motorhomes, selects drive, pushing the down motorhomes with the MD-3060. this special function is almost arrow will change the Select.

6 Transmission have the touch pads so always the economy Shift schedule display incrementally from 6. we will focus on that type. through 1. For example, you may DO NOT Shift light and sensor, if present, and to enter the want to limit the range of forward restore operation, take the diagnostic display mode. Please note gears to 1 through 4 when driving in following steps: 1. Bring the vehicle that the Selector is capable of heavy traffic. (Additional operating to a stop at a safe location and apply displaying two characters at one tips are provided with this article.) the parking brake. 2. Simultaneously time. One character will be shown Holding the up or down arrow will press the up and the down arrows on the "Select" display, and the scroll the numbers until the button is once. On the lever -type Selector , other will appear on the "Monitor".

7 Released or the highest or lowest push the Display Mode button display. For example, the fact that number is displayed. Every selection once to gain access to the diagnostic the oil level is okay will be change will be accompanied by a code information. 3. Press and hold displayed as follows: beep' sound, and a visual change in the Mode button until a tone the Select display. The Monitor is heard, and then release the display will indicate the gear button. Message Select Display Monitor Display currently operating. The Transmission may return Oil Level 0 L. In the event of a Transmission to normal operation. If the Pause . malfunction, the DO NOT Shift condition is temporary, the light may illuminate. This will be DO NOT Shift light will Okay 0 K. accompanied by 8 seconds of short not come back on, and the beeps from the Shift Selector and Transmission will operate indicates that shifts are being normally.

8 If the condition is not The troubleshooting guide included restricted. The Select display will temporary, the DO NOT Shift with this article outlines the not be lit, and Transmission light may come back on. The type of procedure for gaining access to and operation, may be restricted. If the operation permitted by the CPU will interpreting the display codes. You failure allows limited operation, you depend on the type of condition. may benefit from having this guide can proceed to find service Under certain circumstances, a Shift on hand while you explore the assistance. During this time upshifts from neutral to an operating range functions of the Shift Selector . and downshifts may be restricted. may not be permitted. This situation For additional information, Anytime the DO NOT Shift will require immediate attention. contact your local Allison lamp is lit, a diagnostic code will be The up and down arrows are also distributor or dealer.

9 Check the recorded. To clear a temporary used to gain access to the oil level Yellow Pages for the location nearest you.


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